Danza Posted April 20, 2022 Posted April 20, 2022 Hi All I have a Kodak OG5.48 (Axpert King) inverter with 2 x Pylontech US3000 batteries and 8 x 460W panels. My 200lt electric geyser burst and I am now considering various alternative options. My setup can handle a 2KW geyser element off the PV after the batteries are charged at around 11am - so the most cost effective solution I can think of is to get 2 x 150 liter geysers with the first fitted with a 2KW element and connected to the inverter, switch it on only when batteries are full and have it feed the (hopefully) warm water into geyser no 2 which is on the grid permanently. This way the grid element is used as a backup and hopefully the thermostat will rarely switch on since I'm feeding it hot water, but I still have hot water on cloudy days and when having guests. Any thoughts? Quote
Pietpower Posted April 20, 2022 Posted April 20, 2022 That sounds like a plan, I think it will work. Mine is similar and also in series. - Two geysers both hot and in series you can probably only heat once a day (not that it matters much with grid on 2nd geyser) - My 200l lose about 2kWh per day with no water draw. Newer 150l geysers maybe 1.5kWh each or 3kWh total. (including pipes) - Thus without water usage your grid consumption will still be 1.5kWh per day. - Maybe set first geyser to say 65C and second one to 60C to minimise grid power usage. - 3kW element will also work and draw from batteries, then allow enough time to top up batteries again. - You will most likely use 8-10kWh per day to heat the first geyser so maybe not enough juice from 8 panel to fully heat the geyser. I have a cheap flat plate collector on the first 150l geyser and heat the second 200l geyser from PV. - Geyser, flat plate, pump and installation was about R10k - Use no grid power to heat water. - PV load is average 4kWh per day now. (down from about 10kWh) - sometimes run out of battery capacity when cloudy days (set to 35% min) since I have to use PV Quote
Danza Posted April 23, 2022 Author Posted April 23, 2022 Thanks, I'm going to give it a go and see. I will definitely set the temperatures as you suggest, so let's see how that works, and I'll post some results once I've been running a few days. Quote
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