I have made the whole RV essentially into a UPS, excluding water heater and HVAC. A pure sine wave 3,000 watt inverter into a house bank of X Watt hour size. 110V to the battery charger to the battery bank to the inverter to the 110V loads. This puts all loads to the batteries, drawing from them constantly. Charge the battery bank with utility power or generator. AC and water heater are hooked up directly to utility power only.
Plan to duplicate on the boat with larger house bank, preferably Lithium, and use smart charging sources of solar, wind. alternator and any others to top off the bank. If the bank is large enough that no more than 20% is ever discharged, a cycle is not “made/counted” and the battery lasts as if float charged its whole life. Rather than fritz with .1 watt hour load calculations, I just design or buy components for “more”, each buying me additional storage, load capacity or life. A design dream of running a ton or 2 of air conditioning off a battery, you are in the 3kWhr solar and bank capacities range at a minimum and the corresponding large costs. AGM 12V, 140 amp hour @~ $150 each Lithium @ $1,000 each Pure sign wave Inverter at 2,500 Watts, $300-$3,000 (with charger) <modified sign wave inverters give problems to many appliances> 73, KB5F Orin Snook 281-745-0539 ________________________________ From: BVARC <[email protected]> on behalf of John Brockus via BVARC <[email protected]> Sent: Thursday, April 23, 2020 7:43 PM To: BRAZOS VALLEY AMATEUR RADIO CLUB <[email protected]> Cc: John Brockus <[email protected]> Subject: Re: [BVARC] Need advice There's a whole community of people who live in their RVs, and they have some innovative solutions that allow them to run off the batteries, and simultaneously charge the batteries from a variety of sources using solar, generator, or shore power. I don't think they're cheap, though. But they look fairly easy to set up and very flexible. Check out youtube or google RV power systems. On Thu, Apr 23, 2020 at 7:33 PM Rob KC5RET via BVARC <[email protected]<mailto:[email protected]>> wrote: Hello all, I have an issue and I thought, hey, I'm a member now, I'll go to the brain trust that is BVARC. I want a UPS for my home office. I don't want to pay for a APC UPS. I have a couple of gently used RV batteries that I've keeping on a NOCO Genius battery charger in maint mode. is there a gadget I can buy, that will allow me to plug it into house power for power outage detection purposes, but let me use my own batteries for backup when the power goes out. I'm sure MFJ has something like this, but I was thinking something of higher quality. I am still working and do not have the soldering skills to make my own, so I would like to purchase something turnkey that is less than comparatively sized APC system. Any suggestions? 73, Rob, KC5RET ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected]<mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
