Timeline for Suggestions to upgrade this PWM AC circuit to handle 3000w
Current License: CC BY-SA 3.0
19 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 26, 2023 at 19:42 | answer | added | Gil | timeline score: 1 | |
| Jul 18, 2023 at 22:35 | answer | added | Harper - Reinstate Monica | timeline score: 1 | |
| Apr 13, 2018 at 11:18 | comment | added | Kiwi | @ToniHomedesiSaun sorry my dry sense of humour... | |
| Apr 13, 2018 at 11:12 | comment | added | Toni Homedes i Saun | @Kiwi I would never suggest you to build your own transformer. That's something out of the capacities of most engineers today. I meant look for a new or used transformer and use it. | |
| Apr 13, 2018 at 8:40 | comment | added | Kiwi | @Toni Homedes i Saun creating a transformer is beyond me, I'll look into that thanks. The filter looks pricey. | |
| Apr 13, 2018 at 8:37 | comment | added | Kiwi | >The key thing is that the power continues to go through the >mechanical thermostat regardless. I wasn't sure if I was going to leave this in or not, depending on if the contacts were going to arc. | |
| Apr 13, 2018 at 7:00 | comment | added | Kiwi | These replies are exactly the reason why I posted this. Swapping out the element for a lower wattage (has to be custom made apparently) is probably my easiest and cheapest solution. I was hoping to make it a smart solution so to vary the load, looks like it’s not as easy as I had it on paper. (Ignoring said pieces of paper). Thanks everyone. | |
| Apr 13, 2018 at 6:39 | comment | added | Toni Homedes i Saun | A much simpler approach is to use an appropriate transformer and a couple of relays to reduce input voltage to the heating element. if you use a 2:1, old 240 V to 125 V style, you can wire it for 2:3 or 1:2 output which approximate to half and quarter power. | |
| Apr 13, 2018 at 6:34 | comment | added | Toni Homedes i Saun | The idea is nice, but noise and interference on the AC line and radiated RF is likely to go much worst. Be sure to include an RFI filter at the entry, before the bridge. | |
| Apr 13, 2018 at 6:34 | comment | added | user136077 | The questioner seems to be awake. Good! But systems like this surely have some unconditional local security regulations which cannot be skipped legally. It can be difficult to get the critical stamp and signature to the right paper, which is needed to keep the insurances valid. | |
| Apr 13, 2018 at 4:33 | answer | added | Henry Crun | timeline score: 2 | |
| Apr 13, 2018 at 3:47 | comment | added | Henry Crun | @user287001 The key thing is that the power continues to go through the mechanical thermostat regardless. (which is set higher than the electronic control point | |
| Apr 13, 2018 at 1:49 | comment | added | Kiwi | @user287001 Thank you for the safety warning, the tank is outside, has a relief valve, multiple independent microcontrolled temperature sensors and a contactor serving the circuit on a timer and PV sensor. | |
| Apr 13, 2018 at 1:47 | comment | added | Kiwi | @HenryCrun Correct! Meter is measured every cycle from what I understand. 5KW PV system peak. From my calculations, I'd like to reduce the 2400w element to 1000w (as that's what generated surplus cloudy days) by hopefully using a digital approach. In theory, tricking the smart meter (I'd need to see if it actually does in a mock-up first). | |
| Apr 13, 2018 at 1:42 | answer | added | Michael Karas | timeline score: 5 | |
| Apr 13, 2018 at 0:48 | answer | added | user133493 | timeline score: 1 | |
| Apr 13, 2018 at 0:25 | comment | added | user136077 | A project that sounds troublesome. 3000W handled with a hobby circuit has a substantial death toll potential. Before you continue, think what happens, if the system has full power ON continuously and totally unattended. Could you sleep when it steams in your home after a software crash or component failure? | |
| Apr 13, 2018 at 0:13 | comment | added | Henry Crun | Can you be clearer about your objective? I am guessing that you have grid-tie solar and are trying to make export power through the meter zero? In this case the behaviour of your meter is a critical factor. How much solar do you make (peak)? How much will you ever need to put into the hot water, after other standing loads are taken out? | |
| Apr 13, 2018 at 0:00 | history | asked | Kiwi | CC BY-SA 3.0 |