MidNite Solar Integration Guide

Table Of Contents

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Note: Refer to the Discharge Calculation instructions included in your relevant inverter manufacturer

Integration Guide.

When comparing the same system using these two calculations for sizing the PHI battery

bank, the minimum number of batteries should be the greater of the two results (Discharge Calculation &

Charge Calculation).

3.2 – Midnite Solar Charge Controller Battery Bank Sizing

Examples

The Midnite Solar charge controller’s charge current ratings vary by model. The Midnite Solar Classic and

Classic Lite models are listed below.

• Midnite Solar Classic 150 & 150 Lite 96A on 12V / 94A on 24V/ 86A on 48V

• Midnite Solar Classic 200 & 200 Lite 79A on 12V / 78A on 24V/ 78A on 48V

• Midnite Solar Classic 250 & 250 Lite 61A on 12V / 62A on 24V/ 55A on 48V

Recommended minimum PHI battery bank sizes based on Charge Calculations are listed in the table below. The

inverter selection and its max load (kW rating) will determine the recommended Discharge Calculation battery

bank sizing, which may increase the recommended minimum PHI battery bank size.

Table 1.0 – PHI Battery Bank Sizing v. Charge Controller Model

Battery

PHI 3.8 kWh

Model Voltage

48V

24V

Max Continuous Charge Current (A) 37.5 75

Midnite Solar Model

Max Current (A)

Minimum # Batteries in Bank

Classic 150 & 150 Lite 86 (48V) or 94 (24V) 3 3

Classic 200 & 200 Lite 78 3 2

Classic 250 & 250 Lite 55 (48V) 62 (24V) 2 1

4.0 – Program Settings for PHI 3.8 Battery

In order to maintain the Warranty, it is critical to ensure that the appropriate settings for the desired Warranty

are programmed in all of the system components. This section will cover the basic concepts and settings for

Midnite Solar equipment.

4.1 – Depth of Discharge

In order to optimize performance and the life of your system and PHI batteries, SimpliPhi recommends

programming the equipment settings for 80% Depth of Discharge (DoD). This will enable the batteries to

achieve an expected 10,000 cycles. Greater DoD is possible but will result in reduced cycle life.

CAUTION: If a firmware update is executed on Midnite Solar equipment, ALL the settings

must be reverified. The programmed settings shown in the following table must be applied

based on desired Cycle life. The recommended is 80% Depth of Discharge.