Sunny Island 6KW Generator not charging - Error fault code W351 and W319 - PLEASE HELP
I have installed a sunny island 3 years ago and generator still will not charge the batteries. After a number of tests SMA (We are based in the UK and they have offered very little support) have offered to provide a new invertor but we want to ensure it is sunny island.
We have 2 x 3KW sunny boys feeding in solar power which works and a 6KW lister generator for power. However the generator won't charge,
Below is an overview of the issues we have faced this far. We would be very grateful if someone has any advice to get our farm supply working
I hired a 2,4 KW petrol generator and the invertor would charge the batteries. However when I got GEM services (experienced generator / invertor technicians) to check the generator they found no issues. They put in the new batteries but could find nothing wrong with it. When they proceeded to try and make the SMA invertor work they were as mystified as the previous engineer
The engineer has 5 other customers who have the same generator with outback invertors and that works fine. Also my Victron invertor charges batteries with the generator with no issue.
When the generator is on, the invertor tries to synchronise with the generator and as soon as it tries to start charging, the generator voltage plummets to below 180V then fault code W351 and W319. With all the following tests the same thing happens & the voltage drops so fast that the pitch of the generator engine does not change (about 2 seconds)
Tests carried out
- Disconnecting all inputs and outputs other than batteries (the generator live and neutral were the only connection)
- Disconnecting the earth / neutral connection to the generator
- Generator charging voltages and Hertz to make sure they were well within the invertor acceptable parameters
- Reducing the charging current for the batteries
- Testing the voltage dip on the generator when a 3 KW heater was put. The impact was minimal
The only fault that could be found was that part of the date on the data card was corrupted. We then got a new data card (same size) and the data was also corrupted. Would this cause any problems?
Below are Possible solutions for you to fix the problem:
- Get you to replace the invertor under the warrantee as you have offered. However TBC if this would solve the problem as the existing one charged another generator
- Buy another generator – cheapest startomatic is about 2000 GBP, but how can I spent this money without knowing it could be the same problem.