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I have a small p.v. with lithium (BYD LiFeP) backup, just to ensure fridge/freezer/home IT and phones/light/VMC in case of outage, AC-coupled classic inverter t

by kkfx 4y ago

I have a small p.v. with lithium (BYD LiFeP) backup, just to ensure fridge/freezer/home IT and phones/light/VMC in case of outage, AC-coupled classic inverter to do more and recharge in that case. Honestly IF Vehicle2Loads systems became spread AND an open standard I might evaluate them because EVs are NOT cheap and NOT cheaper than ICE so far, but probably they will, for artificial or natural reasons, or anyway due to lack of gasoline/gas they will be needed anyway. Surely the claim of powering for days is a bit exaggerated, more than a bit, but surely with a p.v. combined might be a way to save money in case of very unstable grids witch again is not the case so far but probably will due to various factors... One thing I doubt is the vehicle to grid application for MANY reasons like: - inverters too small and not quick enough to stabilize the grid - I doubt any operator accept energy injections from countless set of moving inverters, home p.v. is normally checked BEFORE allowing to connect to the grid, vehicles move can't be checked up front - I doubt owners want to give their energy to the grid from expensive batteries

lucb1e 4y ago
> - I doubt owners want to give their energy to the grid from expensive batteries Well, of course it would have to make financial sense. Since you want those batteries anyway for driving long distances (say, more than twice the distance of a regular commute is not something most people do daily, but they'll want to be able to go quite far so most cars have quite big batteries), that is a sunk cost. Might as well put them to use on days where you don't want to drive far and electricity is expensive (no sun or wind, or high gas prices or so). > EVs are NOT cheap and NOT cheaper than ICE so far That surprises me. You say you've got a "small" PV installation, how small is small? From what I've heard of PV installation owners with EVs, the per-kilometer cost over the lifetime of the car is much lower, you just have to be able to invest in (or loan) the up-front costs of both and that's what makes it prohibitive still. Does the math not work out for you in that way?
- kkfx 4y ago
  I'm in France, if that matter, small in my case mean 5kW, but that's not the reason, the reasons are: - I already have ICEs cars (two actually) 4x4 and living in the Alps where a 4x4 in winter is very comfy - at actual rates, and re-sale values (witch is practically zero for EVs here) amortize the price of available 4x4 EVs is simply fantasy - at my actual car usage (not that much WFH and doung far less trips than before) amortize the price of available 4x4 EVs is simply fantasy Essentially my ICEs cars work flawlessly and STILL have a re-sale value, a new EVs, a little one, little in price terms, but not so little to be unusable here, perhaps can be paid back in the near future, still not now, surely not a model X or a Volvo. My math simply do not count just energy prices, especially since now/so far I travel not enough, but the TCO. With my small p.v. I can power my house "A-class" i.e. new, insulated very well etc, for almost all loads, water heater system is a big enough cumulus that does not need energy at night, heat-pump (just ~1kW) and classic resistance, so if the Sun shine I can go for resistance or resistance+heat pump, if not but still there is a bit of Sun the heat pump only. It's driven by the inverter so regulate itself depending on current home micro-grid load. Cooking does not demand so much, washing machine, dishwasher etc can normally both run 100% on self-consumption when the Sun shine. Looking back, now, I would made an 8kW p.v. I have enough space for it, but back than just few years ago I do not think that was needed...

by kkfx 4y ago

lucb1e 4y ago

> - I doubt owners want to give their energy to the grid from expensive batteries Well, of course it would have to make financial sense. Since you want those batteries anyway for driving long distances (say, more than twice the distance of a regular commute is not something most people do daily, but they'll want to be able to go quite far so most cars have quite big batteries), that is a sunk cost. Might as well put them to use on days where you don't want to drive far and electricity is expensive (no sun or wind, or high gas prices or so). > EVs are NOT cheap and NOT cheaper than ICE so far That surprises me. You say you've got a "small" PV installation, how small is small? From what I've heard of PV installation owners with EVs, the per-kilometer cost over the lifetime of the car is much lower, you just have to be able to invest in (or loan) the up-front costs of both and that's what makes it prohibitive still. Does the math not work out for you in that way?

kkfx 4y ago
I'm in France, if that matter, small in my case mean 5kW, but that's not the reason, the reasons are: - I already have ICEs cars (two actually) 4x4 and living in the Alps where a 4x4 in winter is very comfy - at actual rates, and re-sale values (witch is practically zero for EVs here) amortize the price of available 4x4 EVs is simply fantasy - at my actual car usage (not that much WFH and doung far less trips than before) amortize the price of available 4x4 EVs is simply fantasy Essentially my ICEs cars work flawlessly and STILL have a re-sale value, a new EVs, a little one, little in price terms, but not so little to be unusable here, perhaps can be paid back in the near future, still not now, surely not a model X or a Volvo. My math simply do not count just energy prices, especially since now/so far I travel not enough, but the TCO. With my small p.v. I can power my house "A-class" i.e. new, insulated very well etc, for almost all loads, water heater system is a big enough cumulus that does not need energy at night, heat-pump (just ~1kW) and classic resistance, so if the Sun shine I can go for resistance or resistance+heat pump, if not but still there is a bit of Sun the heat pump only. It's driven by the inverter so regulate itself depending on current home micro-grid load. Cooking does not demand so much, washing machine, dishwasher etc can normally both run 100% on self-consumption when the Sun shine. Looking back, now, I would made an 8kW p.v. I have enough space for it, but back than just few years ago I do not think that was needed...