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Motorhome Solar Power System Issue
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<blockquote data-quote="condor22" data-source="post: 240634" data-attributes="member: 1932"><p>Pablo,</p><p></p><p>I have to disagree with the microwave logic.... Fluffy is using it on an inverter, but, he doesn't say what wattage it is. However, my microwave is a small one of about 850W output , but uses nearer 1100W of input power.</p><p></p><p>So 1100W @ 240VAC is about 4.6A, on that you are correct. BUT and it is a BIG but.....</p><p></p><p>When running on an inverter you need to divide the same 1100W by the input voltage which is nominally 12VDC, which is a bit over 91A, but probably over 95A with efficiency loss. This means that for every 5 minutes of microwave use, the battery discharges at least 7.7AH. Then it's plus the 2A per hour used which is 48AH per day, totalling over 50AH then there's lighting, etc.</p><p></p><p>390AH of batteries (which I assume are the 3 x 130AH in parallel) should be more than enough. However, if the batteries are going flat, there are 2 main reasons to look at first. either the batteries are not getting enough charge, or, they are not holding the charge. The trouble with 3 paralleled batteries is that if one is stuffed, the whole system is stuffed. I'll write a bit more tomorrow, it's getting late........</p><p></p><p>Late thought - Or, another possibility is there is a current leak that is not being monitored.</p></blockquote><p></p>
[QUOTE="condor22, post: 240634, member: 1932"] Pablo, I have to disagree with the microwave logic.... Fluffy is using it on an inverter, but, he doesn't say what wattage it is. However, my microwave is a small one of about 850W output , but uses nearer 1100W of input power. So 1100W @ 240VAC is about 4.6A, on that you are correct. BUT and it is a BIG but..... When running on an inverter you need to divide the same 1100W by the input voltage which is nominally 12VDC, which is a bit over 91A, but probably over 95A with efficiency loss. This means that for every 5 minutes of microwave use, the battery discharges at least 7.7AH. Then it's plus the 2A per hour used which is 48AH per day, totalling over 50AH then there's lighting, etc. 390AH of batteries (which I assume are the 3 x 130AH in parallel) should be more than enough. However, if the batteries are going flat, there are 2 main reasons to look at first. either the batteries are not getting enough charge, or, they are not holding the charge. The trouble with 3 paralleled batteries is that if one is stuffed, the whole system is stuffed. I'll write a bit more tomorrow, it's getting late........ Late thought - Or, another possibility is there is a current leak that is not being monitored. [/QUOTE]
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Motorhome Solar Power System Issue
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