<div dir="ltr" gmail_original="1"><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">Thanks, Jay. Any thoughts on whether a 100A 12V converter is adequate to handle the startup surge of a modern 120V full-size refrigerator when an existing 400W load is present? That would be my design parameters. </div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">I guess the other question is, what happens if the converter is overloaded? I know they have overload protection, but what is the reset procedure?</div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Principal Solar Designer | Florida Solar Design Group</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">NABCEP Certified Solar Professional (PVIP)</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><img width="0" height="0" class="mailtrack-img" alt="" style="display:flex" src="https://mailtrack.io/trace/mail/w/cmUtd3JlbmNoZXNAbGlzdHMucmUtd3JlbmNoZXMub3Jn/726c78a24ea801db76f82ad0844c0dbfdb4258e7.png?u=1613865" ><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Apr 23, 2024 at 6:01 PM Jay via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">I’ve done this many times <br>
<br>
I use an Iota or power max charger to run the DC. <br>
<br>
Jay<br>
<br>
> On Apr 23, 2024, at 2:42 PM, Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches<wbr>.org</a>> wrote:<br>
> <br>
> <br>
> I have an off-grid client who is working on replacing old equipment at a cabin. He has a lot of 12 volt distribution in the house for lighting, fans, and a 12 volt refrigerator. He also has 120 volt AC loads that run through a separate distribution panel where the only source is a 2000 Watt Honda generator. There is no inverter present. The batteries are charged through a Trace C40.<br>
> <br>
> He currently has a few ancient solar panels and a struggling Bank of AGM batteries. It's time for an upgrade. I can easily supply enough PV power for what he needs. He currently has a 9 kilowatt hour battery capacity that he was happy with when the batteries operated optimally. Nonetheless, I would probably future-proof him with a 10 to 15 kilowatt hour LiPo to double or triple his usable capacity.<br>
> <br>
> For convenience, obviously it would be nice to have an inverter to eliminate or reduce the generator requirement. But he seems committed to keeping his 12 volt distribution because it would be costly to replace fixtures. I think he would consider replacing the 12 volt refrigerator if he has an inverter. <br>
> <br>
> He definitely wants LiPo batteries. <br>
> <br>
> I don't like the idea of 12 volt direct from a battery plus connecting an inverter to that same battery. It is going to be hard to measure and monitor things. <br>
> <br>
> I am thinking about using a 48 volt battery with a single phase 120 volt inverter, getting him to change to a 120 volt refrigerator, and using a DC converter to give him somewhere in the range of 100 amps at 12 volts for his existing DC lighting and fan loads. Is this a bad idea? Should I stick with a 12 volt battery system? He does have a tiny 12 volt pressure pump which might be an issue for the converter. I'm not sure. I am a bit worried about the efficiency loss and capacity of DC converters and not sure how to size it.<br>
> <br>
> Jason Szumlanski <br>
> Florida Solar Design Group <br>
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