Deonbayly Posted August 1 Share Posted August 1 Hi guys I'm totally off grid so any problems with water or power escalate extremely quickly! I'm tearing my hair out over this one. I'm running my single phase borehole motor off solar and an Aspire 2,2kw LS inverter through a control box. This has been working great for a couple of years. Yesterday I got Error A03 - Dry running 1. Water level in the well is low. 2. Nominal power of motor is not setting. We can rule out 1. I changed the motor nominal power to 1.5kw, although in the past it was set to 2.2kw. This was just in case I forgot which pump is actually down the hole! I know, I know. Error persists. Since (to my amateur logic) this looks like a low current error (it sees the pump as being out of the water = low resistance = lower amps?) I've been slowly reducing the nominal current setting, all the way down to 5A, but the error persists. The system is up for maybe 4 seconds before shutting down. I've now got enough water left for maybe 2 days and I'm not sure what to try next! Has anyone been in this situation or have any advice on what to try? Many many thanks!! Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted August 1 Share Posted August 1 1 hour ago, Deonbayly said: Hi guys I'm totally off grid so any problems with water or power escalate extremely quickly! I'm tearing my hair out over this one. I'm running my single phase borehole motor off solar and an Aspire 2,2kw LS inverter through a control box. This has been working great for a couple of years. Yesterday I got Error A03 - Dry running 1. Water level in the well is low. 2. Nominal power of motor is not setting. We can rule out 1. I changed the motor nominal power to 1.5kw, although in the past it was set to 2.2kw. This was just in case I forgot which pump is actually down the hole! I know, I know. Error persists. Since (to my amateur logic) this looks like a low current error (it sees the pump as being out of the water = low resistance = lower amps?) I've been slowly reducing the nominal current setting, all the way down to 5A, but the error persists. The system is up for maybe 4 seconds before shutting down. I've now got enough water left for maybe 2 days and I'm not sure what to try next! Has anyone been in this situation or have any advice on what to try? Many many thanks!! What is the PV Array size you have connected and how are the labels connected? You mention you running of solar. Do you have no grid connected? Quote Link to comment Share on other sites More sharing options...
Deonbayly Posted August 2 Author Share Posted August 2 Hi Scorp007 I have 9 Canadian Solar panels in series, 380W, Vmp 34.5v and Voc 41.2v Cheers Quote Link to comment Share on other sites More sharing options...
Deonbayly Posted August 2 Author Share Posted August 2 Manual says: PV Module Selection: When selecting proper PV modules, please be sure to consider below parameters: 1. Open circuit Voltage (Voc) of PV modules not exceeds max. DC voltage (450VDC). 2. Accumulated voltage of connected PV panels should be close to 330V for inverter with 220V output voltage. To calculate PV module numbers in series (N) and in parallel (M), please follow below formula: For three-phase output: Imp>Po/(Kvo x 0.9 x M) For single-phase output, please use 2 times of PV power rating. Imp>2 x Po/(Kvo x 0.9 x M) Po represents the rated output power. Kvo is equal to 330V/345V/360V for 220V/230V/240V output voltage respectively. Maximum PV module numbers in series (N) > 330 / Vmp We strongly recommend the total PV Vmp is around 330Vdc to get the optimum MPPT output. Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted August 2 Share Posted August 2 5 minutes ago, Deonbayly said: Manual says: PV Module Selection: When selecting proper PV modules, please be sure to consider below parameters: 1. Open circuit Voltage (Voc) of PV modules not exceeds max. DC voltage (450VDC). 2. Accumulated voltage of connected PV panels should be close to 330V for inverter with 220V output voltage. To calculate PV module numbers in series (N) and in parallel (M), please follow below formula: For three-phase output: Imp>Po/(Kvo x 0.9 x M) For single-phase output, please use 2 times of PV power rating. Imp>2 x Po/(Kvo x 0.9 x M) Po represents the rated output power. Kvo is equal to 330V/345V/360V for 220V/230V/240V output voltage respectively. Maximum PV module numbers in series (N) > 330 / Vmp We strongly recommend the total PV Vmp is around 330Vdc to get the optimum MPPT output. I see the manual and as you indicated the PV to be 2 times the motor size. Thus one should try to get to 330V and also 4.4kW of panels by having say series and 2 strings in parallel. Not a easy configuration. Previous question. Do you have grid connected? Quote Link to comment Share on other sites More sharing options...
Deonbayly Posted August 2 Author Share Posted August 2 Hi Apologies, no, I have no grid connection. I have used a generator before when I had to pump water in the dark. I tried that yesterday with the same result. I may have some more of the same panels in the shed, I'll go and have a look. Cheers Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted August 2 Share Posted August 2 19 minutes ago, Deonbayly said: Hi Apologies, no, I have no grid connection. I have used a generator before when I had to pump water in the dark. I tried that yesterday with the same result. I may have some more of the same panels in the shed, I'll go and have a look. Cheers If the inverter fails even with genny there must for sure be a problem. Or did you connect the pump directly on the genny and not via inverter? Quote Link to comment Share on other sites More sharing options...
Deonbayly Posted August 2 Author Share Posted August 2 No, I have wired the gennie through the inverter and control box. Quote Link to comment Share on other sites More sharing options...
Deonbayly Posted August 2 Author Share Posted August 2 I called the supplier. He suggests that I cut out the control box and wire the pump directly to the inverter as the inverter has its own controller. I'm going to go and try that now.... Quote Link to comment Share on other sites More sharing options...
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