mrjohnson99
New Member
- Joined
- Sep 12, 2022
- Messages
- 1
I've just asked Marlec, who make iBoost, and got a non-answer. I've read the manual and understand the basics behind the unit.
Not an expert in any way, so expecting to be corrected.
I'm planning to put in a 2.4kw system with a 5kwh battery.
First principles first. V = IR. P = IV. So P = I squared x R. So heat from an immersion heater resistance is proportional to the current squared, up to the maximum rating of the heater. In round figures, a 3kw immersion (a/c) is 12A at 240V. I know it's not quite that simple for a/c.
Doesn't this mean if I can only spare 1.5kw for the heater it produces a quarter of the heat? At 0.75kw a sixteenth of the heat? Won't that mean very poor efficiency with a 3kw immersion?
iBoost says it will work with any immersion up to 3kW. Would I get more heating overall with a 2kW or 1kw immersion? I don't need rapid heating at all. The tank is currently heated by gas for an hour in the morning, so this would be substituted by solar heating the previous day. I have a 120l tank which, by my calculations, needs around 5.5 kwh for a 40C temperature increase.
My head hurts!
Thanks in advance,
Martyn
Not an expert in any way, so expecting to be corrected.
I'm planning to put in a 2.4kw system with a 5kwh battery.
First principles first. V = IR. P = IV. So P = I squared x R. So heat from an immersion heater resistance is proportional to the current squared, up to the maximum rating of the heater. In round figures, a 3kw immersion (a/c) is 12A at 240V. I know it's not quite that simple for a/c.
Doesn't this mean if I can only spare 1.5kw for the heater it produces a quarter of the heat? At 0.75kw a sixteenth of the heat? Won't that mean very poor efficiency with a 3kw immersion?
iBoost says it will work with any immersion up to 3kW. Would I get more heating overall with a 2kW or 1kw immersion? I don't need rapid heating at all. The tank is currently heated by gas for an hour in the morning, so this would be substituted by solar heating the previous day. I have a 120l tank which, by my calculations, needs around 5.5 kwh for a 40C temperature increase.
My head hurts!
Thanks in advance,
Martyn