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Is my inverter undersized?
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<blockquote data-quote="binky" data-source="post: 525953" data-attributes="member: 490"><p>that would definetly appear to be undersized for the size of your array. Whilst the inverter can cope with your array, the fact it is only 3kw is choking the system. In winter that will make little difference, but for around 2/3rds of the year it's not the best set-up. </p><p></p><p>It was standard practice to undersize inverters 10 years ago down to 80% of the array size, but inverters are vastly more efficient than they were back then, and I stopped doing that around 8 years ago. If you do get the bigger inverter it will probably need restricting on the export to the grid to 16A, but it will do a much better job of charging the batteries first before having to self limit. If you are using a lot of leccy in the house, it should prioritise energy to battery / house first before limiting anything to the grid, so if you are generating say 5kW and using say 4 kW within the house, it wouldn't limit the 4kW and still allow 1kw back to the grid if the battery is fully charged, or direct 1kw into charging the battery if not fully charged - hope that makes sense.</p></blockquote><p></p>
[QUOTE="binky, post: 525953, member: 490"] that would definetly appear to be undersized for the size of your array. Whilst the inverter can cope with your array, the fact it is only 3kw is choking the system. In winter that will make little difference, but for around 2/3rds of the year it's not the best set-up. It was standard practice to undersize inverters 10 years ago down to 80% of the array size, but inverters are vastly more efficient than they were back then, and I stopped doing that around 8 years ago. If you do get the bigger inverter it will probably need restricting on the export to the grid to 16A, but it will do a much better job of charging the batteries first before having to self limit. If you are using a lot of leccy in the house, it should prioritise energy to battery / house first before limiting anything to the grid, so if you are generating say 5kW and using say 4 kW within the house, it wouldn't limit the 4kW and still allow 1kw back to the grid if the battery is fully charged, or direct 1kw into charging the battery if not fully charged - hope that makes sense. [/QUOTE]
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