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Description
Autotransformer - Split Phase 120/240V - 100AMP
The Autotransformer: for step up, step down and split phase balancing An autotransformer can be used for step up, step down and split phase output balancing purposes. While the step up and step down functions are fairly straightforward, split phase output balancing may require some more attention.
Consider for example a 30A 120/240V split phase supply. The supply could be the grid, a generator or two stacked inverters. Some of the loads connected are 240V, others are 120V. On each 120V leg the load should not exceed 30A. The problem is that as soon as 120V loads are connected, the two legs will show a different current. This is because the 120V loads on the two legs will never be balanced. A 120V 1200W hairdryer, for example, will draw 10A from one leg. A 120V washing machine could even draw in excess of 20A from one leg. Between the two legs the difference in current, or current unbalance, will therefore often be 20A or more. This means that the 30A supply will not be used up to its full potential. By the time one leg draws 30A, the other leg may be drawing no more than 10A, and increasing the 240V load, for example, will result in an overload of one leg while the other leg still has spare capacity. Theoretically, the total power that can be drawn from a 30A 120/240V supply is 30 x 240 = 7,2 kVA. In case of 20A unbalance, the practical maximum will be 30 x 120 + 10 x120 = 4,8kVA, or 67% of the theoretical maximum. The solution is an Autotransformer. By leaving the neutral of the split phase supply unused, and connecting an Autotransformer to create a new neutral, as shown in figure 1, any load unbalance is ‘absorbed’ by the Autotransformer. In case of a 30A supply, the load can be increased to 7,2kVA, and a 20A load unbalance will result in one leg supplying 40A, and the other leg 20A. The 20A difference will flow through the neutral and the windings of the Autotransformer. The current through both 120V wires of the split phase supply will be 30A.
Temperature protected In case of overheating, the Autotransformer is disconnected from the supply. Reset is manual. Ground relay for use with Multi or Quattro Inverter/Chargers included When operating in inverter mode, the neutral output of the inverter/charger must be connected to ground to guarantee proper functioning of a GFCI. In case of a split phase supply the neutral must be grounded. For this purpose a grounding relay is built in the autotransformer’s enclosure. The relay is controlled by the 230/240V Multi or Quattro. (The internal grounding relay in the 230/240V Multi or Quattro must be disabled)
An alternative to stacked inverters The alternative to stacking two 120V inverters to provide a 120/240V split phase supply is a 240V inverter with an additional Autotransformer.
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.
Please contact your dealer for any returns, repairs or support issues related to this product.
30-Day Return Policy We have a 30-day return policy, meaning you have 30 days after receiving your item to request a return or exchange.
Eligibility for Returns To be eligible for a return, your item must be in the same condition that you received it—unworn or unused, including tags, instruction manuals, warranty cards, and in its original packaging. You’ll also need the receipt or proof of purchase. We reserve the right to refuse returns or assess additional fees at our discretion if the merchandise is missing parts or is not in new condition.
Returns accepted for 30 days
Customer is responsible for return shipping. If you request The Yacht Rigger to provide a shipping tag, the shipping cost will be deducted from your refund.
A 3% restocking fee will apply.
No returns on final sale items.
If your return request is accepted, we’ll send you a return shipping label and instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
Damages and Warranties Please inspect your order upon receipt and contact us immediately if the item is defective, damaged, or if you received the wrong item. Most items we sell are covered by manufacturers' warranties. If you experience difficulty with a product, please contact the appropriate manufacturer for assistance or email us at sales@theyachtrigger.com.
Exceptions / Non-Returnable Items Certain types of items cannot be returned, such as custom products and special orders. We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item. Unfortunately, we cannot accept returns on sale items or gift cards.
Exchanges The fastest way to ensure you get what you want is to request a return of the item you have. Once the return is accepted, you can make a separate purchase for the new item to ensure it is in stock.
European Union 14-Day Cooling Off Period If the merchandise is being shipped to the European Union, you have the right to cancel or return your order within 14 days, for any reason and without justification. As above, your item must be in the same condition that you received it—unworn or unused, with tags, instruction manuals, warranty cards, and in its original packaging. You’ll also need the receipt or proof of purchase.
Refunds We will notify you once we’ve received and inspected your return and inform you if the refund was approved. When processing a refund, no additional transaction fee is incurred; however, the original credit card transaction fee is not refunded. If approved, you’ll automatically be refunded to your original payment method within 10 business days. Please allow some time for your bank or credit card company to process and post the refund. If more than 15 business days have passed since we’ve approved your return, please contact us at sales@theyachtrigger.com.
Return Policy Abuse We reserve the right to refuse service to anyone suspected of abusing any policy of The Yacht Rigger.
I haven't installed yet, but Mike and Andre at The Yacht Rigger have been nothing short of excellent and patient in answering my numerous questions pertaining to my project of converting my house bank to LiFePo. Will be starting on the install shortly (which will include the installation of two Class T 400A fuses as well as other items purchased from TYR).
Blue Sea 5121 400AMP Class T Fuse
Customer
Complete Order
This is a review for my complete order of 2/0 AWG Battery Cable Red and Yellow, the Victron BMV-712 Black Smart Battery Monitor, 2 ea Blue Sea 5191 Terminal Fuse Block 30-300AMP with 2 ea Blue Sea 5189 250A Fuse Terminal and 5190 Blue Sea 5190 300A Fuse Terminal (1 installed, 1 standby), and 1 Egis XD Series Single Flex 2 Relay-ACR. All installed by me as directed by The Yacht Rigger electrical experts. New dual starter battery installation was smooth and easy. Works like a champ with no issues! This is the first time since I owned this boat that I can see the stater battery condition!
Victron BMV-712 Black Smart Battery Monitor
Customer
Complete Order
This is a review for my complete order of 2/0 AWG Battery Cable Red and Yellow, the Victron BMV-712 Black Smart Battery Monitor, 2 ea Blue Sea 5191 Terminal Fuse Block 30-300AMP with 2 ea Blue Sea 5189 250A Fuse Terminal and 5190 Blue Sea 5190 300A Fuse Terminal (1 installed, 1 standby), and 1 Egis XD Series Single Flex 2 Relay-ACR. All installed by me as directed by The Yacht Rigger electrical experts. New dual starter battery installation was smooth and easy. Works like a champ with no issues!
Pacer Yellow 2/0 AWG Battery Cable - 50
Conan Disney
Easy install and fast charging
Arco A 275 alternator is almost a perfect fit on a yanmar 4jh3e. Installed with balmar pulley kit . Easy install and fast charging .n more belt dust covering everything.
ARCO Zeus A275L Alternator
Conan Disney
Providing a lot of power.
3@405 watt rec panels on top of Bimini with 2@ Hyundai bifacials on top of Atlantic tower. 1x2 “ anodised aluminum used for supports . Each panel has their own mppt charge controller due to the amount of Shade on my sailboat.panels are providing a lot of power.
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.
